I've always been curious about the time slot? Anyone remember?

According to "The Complete Directory to Prime Time Network and Cable TV Shows":

November, 1978 - October, 1979 - Friday, 8PM
October, 1979 - October, 1981 - Wednesday, 9PM
October, 1981 - August, 1982 - Thursday, 9PM
August, 1982 - August, 1985 - Saturday, 8PM
September, 1985 - March, 1986 - Friday, 9PM
June, 1986 - August, 1986 - Saturday, 8PM

You could also try out IMDB.com

I used to watch on NBC on saturdays @ 8pm then watched it on ABC on Friday then Saturday nights. During 1981 and 1982, I do remember watching reruns on NBC as a four year old.